Balancing all
parameters for generating electricity from a specific EKS at a particular site
results in an altitude at which net cost for useful energy is minimal. Engineers
are working on how to calculate the altitude sweet spot for a particular EKS and
working site.

Handy measures
for input to a formula are wanted. Practical truncation of the parameter
list will be needed. Eventual rules of thumb will arrive. The mode of
extracting system energy will differ and change the sweet spot.
Winds-aloft report will alter the sweet spot. Size and specific kite
design will matter. Etc.

In soaring, MacCready came up with the MacCready Ring
for speed-to-fly. What will AWE come up with for setting a working kite
system at the altitude sweet spot? First offers from the AWE community
may well get improvements later.

When all costs
are considered, some altitude profile will in a particular instance
result in the lowest cost per unit of useful energy.